Method of producing quinazoline derivatives



States METHOD OF PRODUCING QUINAZOLINE DERIVATIVES 7 No Drawing nnama 'zz, 1957, Set. 660,773

4Claims. cum-251 This invention relates to a new method ofproducing qllifiaZOlifiQdhliVBtiYfiS I-and/or indazolone derivatives by contacting carbon monoxide with azobenzene derivatives at superatmospheric pressure in the presence of a cobalt or iron catalyst. More particularly the present inventlon relates to a new method of producing quinazoline derivatives wherein carbon monoxide is contacted with a10- benzene derivatives at a superatmospheric pressure at a temperature below 200 C. in the presence of a cobalt or ironcatalyst and, either taking out or without taking out the thus obtained indazolone derivatives, the above reaction is repeated at 'a temperature above 200 C. to producequinazoline derivates. The quinazoline derivatives may directly be produced by contacting carbon monoxide with the starting material of azobenzene at a temperature above 200 C. in the presence of the same catalyst. In such reaction, indazolone cannot be isolated. 1

The method of the present invention'is represented by the following reaction formula:

Q R R R R E 200 l H s. f

wherein R and R are selected from the'group consiste ing of hydrogen "and halogen atoms, and lower alkyl, lower alkoxy, hydroxy, amino, di-(lower alkyl)-arnino and aryl radicals. p a f. The indazolone derivatives and quinazoline derivatives obtained by the present'method are very valuable compounds as synthetic chemical intermediates in producing dyestufls, medicines and industrial chemicals.

Numerous methods of producing quinazoline deriva-. tives from anthranilic acid and phenylurea have already been known. (For example, 'Ber.'43,.l237, 1910.) One ofthe convenient methods is, as recently practiced, to obtain them from phenylurea and carbon dioxide (Chemical Abstracts, 48, 8790, 1940), but the yield of this method is only at the highest. The synthesis of indazolone derivatives is more complicated. For examice such type of carbonyl compound that it can not prople, though they canbe produced by the reaction between 2-phenylhydrazinobenzoic acid (Ber. 55, 2680, 1922) and duce hydrocarbonyl. From the foregoing, it is clear that appearance of an economical and practical method of producing such compounds has been earnestly looked for in the art. t r

- The present invention is based on our discovery of a new reaction of carbon monoxide at superatmosphen'c pressure with the Schifis base (Journal of American Chemical Society, 77,6403, 1955). More particularly, ithas been found that a new reaction occurs when cars bon monoxide is contacted with a raw material of aro-. matic azo compound at superatmospehic pressure in the presence of said catalyst and that indazolone derivatives and quinazoline derivatives are produced at high yields by such unexpected reaction.

. In accordance with the invention, when carbon monoxide is contacted at superatrnospheric pressure with azobenzene derivatives represented by the general formula wherein R and R are selected from the group consisting of-(hydrogen, halogen, lower alkyl, lower alkoxy, hydroxy, amino, di-(lower alkyl) amino and aryl groups in the presence of such metallic carbonyl catalyst as, for example, cobalt carbonyl or iron carbonyl, which can produce hydrocarbonyl in a substantially anhydrous organic solvent ind-azolone derivatives represented bythe general formula),

(wherein R and R are the same as are mentioned above) and/ or quinazoline derivatives represented by the general formula (wherein R and R are the same as are mentioned above) will be obtained independently in economical yields without accompanying substantially any troublesome byproduced impurities. It is also found that the present reaction requires to be carried out under a substantially anhydrous condition and any carbonyl catalyst which cannot produce such hydrocarbonyl as nickel carbonyl 'which is described in aforementioned U.S.P. 2,769,003

' cannot successfully be used in the method of the preslline derivatives fromazobenzene derivatives.- 4 I Another object of the present invention is tozprovide ent'invention. Further, "according to the researches made by-the-inventors, "it is also found that, in thereaction-of the present invention, as shown by the above mentioned reaction formula, incase" 1 mol of carbon monoxide; acts on azebenzene'; derivatives, the indazolone derivatives I represented }by the above general formula are obtained V and ji-n case'2 m'ols of carbon monoxide act' the'reon, the

quiriazeline derivatives represented by the above general tannins are obtaincd. Each or these two processes can' be freely selected by controlling the reaction *tem'pe'ra tnre; if need 'be,-the tquin azoline derivatives represented by the above general formula can likewise be obtained by' -contac'ting 1 tool of carbon monoxide'with'the -indazolone derivatives represented by thefaibove gener-a'l formula ata temperatureabove200 C. An obiect of the present invention is 1 to provide a new method f producing indazolone der ivativesand quinazoa newlnre'thod of producing separately and economically azdber'i'zene dcrivatives. I a

v further object of the present-invention is to produce compounds which are useful for synthetic chemical intermediates in producing dyestuifs,'medicines and industrial chemicals.

"A furtherjobject of the present invention is to provide dazolone derivatives. I fither'obiec'ts will be apparent from the description 6f the invention given herein-after.

l he azobenzene derivatives-which'are starting material I of the present invention may have such substitucnts as are specified by the above general :formula. The typical compounds thereof are enumerated as follows: W

Azobenzene; 'haloazobenzene such as '2-chloroazobenzene, 4-chloroazobenzene 2,2-dich1oroazobenzene, and

ame-one, p

but a solvent which is high in polarity and has a low dielectricconst-antis-improper. Usually an aliphatichydrocarbon or an aromatic hydrocarbon can be used.

' Especially the latter'is preferable. 'Then, carbon monoxide is pressed under a pressure of about 10 to 200 or more atmospheres, preferably'l00 to 200 atmospheres, into the contents of the autoclave. When said contents are heated'preferably whiletbeing -shak'en at'a tempera ture of abOutISO to about 3.00 -,C. for abOutOIT'tQ 3 hours, the carbon monoxide is quickly absorbed and the reaction proceeds; After completion-of the lreaction,ithe' contents are cobledafid thegexcess gas is discharged.

7 Then the contents of "the 'autcxilaveare taken-"out. The objective reaction product ;is'=taken'out from the reaction 'moved by filtration. The filtrate is made acidic. The

,thus' deposited solid isi' separate'd and is' then refined'by indazolone derivatives*and'guinazoline derivativesfrorri I *a method-of producing 'qninazoline derivatives from *in- V product mixture by a proper means. For example, after the solvent is distilledofi, the residue is dissolved in a dilute alkaline-solution. Insoluble substances are rerecrystallization. 1 'By-product diph'enylurea-or its-derivative is *obtainedffrom the residueinsolublein said dilute'.

alkaline solution.

The'reaction temperature in this reaction is a critical condition in determinirig the process of the reaction. In case a comparatively low'temperatuie of 150 to 200 7 C. or, specifically about 180 C. is adopted in the above mentioned range of temperature conditions, 'an'indazolone derivative is mainly obtainedas the reaction product."

On the other hand, if a comparativelyhigh temperature of 200 to 3005 C. or specifically higher .than 230 'C. is adopted, -a-'quinazoline derivative is mainlyobtained. Further, after'or'without taking out of the reactiongsys'tem 'the indazolone' derivativeobtained by employing said comparatively low temperature, if the reaction is repeated 4,4'-.dichloroazoben zene; lower alkylazobenzenes such as A 2methylazoben'zene,' 4-methylazobenzene, 4,4' -dirnethylazfobenzene and 4 -ethylazobenzene; lower alkoxyazoben- 16368511611135 2,-methoxyazobenzene,4-methoxyazobenzene ZZf-dimethoxylazobenzene, and 4;4-dimethoxyazo.ben-

' zene;.hydroxyazohcnzenes such as 4-hydroxyazoben2gene; V

airlinm orilower.alkylarninoazobenzenes ,such 25.4 31111110- azobnzene, 4,4-diaminoazobenzene, 2 -.di (.lower'alkyl) aminoazobenzenes, and 4-di-(lower alkyl) aminoazoben zenes; arylazobenzene such as 2-.phenylazobenzene, and

4-phenylazobenzene.

The symbols R and.R of the'azobe nzene may be same or different. However, for the purpose of obtaining useful chemicals by 'further hydrolyzing .the present prod-.

ucts, it is desirable that the R and R are same or that;

either R or R is hydrogen.

' In case azobenzene derivatives having such substituents as are mentioned above are used for the starting material, in dazolo ne derivative or quinazoline derivative obtained therefrom will consequently have the corresponding sub- 7 ample, cobalt carbonyl, iron carbonyl, inorganic and organic acid salts of cobalt, and cobalt complex salts are typical. Cobalt carbonyl is most preferable. i 1 Accerding to one embodiment of the method of the present invention, a starting material of azobenzene derivative isdissolved in aproper organic solvent, a catalytic amount of one or-more of the above mentioned catalysts is ea'dded ithereto'and the solution is introduced into an autoclave. I -Anorganic solvent which is inactive in this reaction and whichihas a-proper solubility can be used tioned above. 7

Therefore, the'method of the present application can be practised also by such batch process as is shown in the under the "same condition except that the temperature is raised above 230? 'C., a gulnazoline derivative will'be likewise obtained; 'Therefore, the indazolone deriva- A tive can be considered to bean intermediate product in producing a guinazoline derivative from a starting material azobenzene derivative according to the present invention. If an intermediary temperature within said temperature ranges, for example, about 200 Cjis adopted,a various mixture of an indazolone derivative anda quinazoline derivative "can be obtained depending upon" the reaction conditions. I p

The reaction of the present invention is substantially completed within a short 'periorrafter the beginning of the reaction under. such reaction conditions as are men- The life of .the catalyst is pretty. long.

above embodiment or by continuous operation of any system.

embodiments of the method of the present inve ntion The inda zolone derivatives and quinazoline derivatives obtainedby the method of the present invention can be used as they are .or converted by various chemical reactions into other useful chemicals. the quinazoline' derivatives will give 7 anthranilic acid derivatives at favorablewields by hydrolysis.

The following examples are to exemplif'y' 'favorable but should not be construed for limitation.

i 7 Example] a 5 g. of azobenzene, 1 g. of cobalt carbonyl and SOcci of ben'zene'wereput-into a stainless steel (18 8) autoclave '(a capacity of cc.).', Carbon monoxideunder atmospheres was pressed into 'the autoclave; The

contents 'wereshaken at to 80? C. After'2 hours,

the contents of the autoclave were taken out. The in-" soluble crude product was taken'by filtration and "was treated with 2 .to 3% sodium hydroxide solution and insolublediphenylurea was removed. The alkaline .solu tion was made acidic with CO .or-an acid; .The acidic substance thus deposited wasrecrystallized' from alcohol.

Further, especially 3 The yield of 2-phenylindazo1one was 2.8 g. (49.1% of the calculated amount). Its melting point was 204 C.

Example 2 1.3 g. (23.8% of the calculated amount) of 2-phenyl- S-chloroindazolone of a melting point of 233 C. were obtained under the same reaction condition as in Example l'from g. of 4-chloroazobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene.

Example 4 5 g. of 4-dimethylaminoazobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were contained in a stainless steel autoclave of a capacity of 100 cc. and carbon monoxide under 150 atmospheres was pressed in and was made to react therewith at 170 to 180 C. for 3 hours. The reaction product was filtered. When the filtrate was concentrated, a crude product was obtained. After said crude product was made acidic with dilute hydrochloric acid, .it was neutralized with dilute sodium hydroxide solution to be slightly acidic (pH 4). Thus 4.5 g. (80.0% of the calculated amount) of 2-phenyl-5-dimethylaminoindazolone of a melting point of 217 C. were obtained.

Example 5 5 g. of azobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were put into a stainless steel (18-8) autoclave of a capacity of 100 cc., carbon monoxide under 150 atmospheres was pressed therein and was made to react with the contents at 230 C. After 3 hours, the contents were taken out. When they were filtered, 5.2 g. of a crystallized mixture were obtained. The mixture was treated with 2 to 3% sodium hydroxide solution and 1.0 g. (17.2% of the calculated amount) of insoluble diphenylurea were removed. When the alkaline solution was made acidic with CO or hydrochloric acid, 4.2 g. of crude 3-phenyl 2.4 dioxo-1.2.3.4-tetrahydroquinazoline were obtained. Its melting point was 273 to 275 C. The yield was 64.6% of the calculated amount.

Example 6 When 5 g. of azobenzene, 1 g. of iron carbonyl and 50 cc. of benzene were treated the same as in Example 5, the yield of 3-phenyl-2.4-dioxo-1.2.3.4-tetrahydroquinazoline was 15.4%.

Example 7 -When 5 g. of azobenzene, 1 g. of acetylacetonecobalt complex compound and 50 cc. of benzene were treated the same as in Example 5, 1.5 g. (23.1%) of 3-phenyl- 2.4-dioxo-1.2.3.4-tetrahydroquinazoline and 0.3 g. of diphenylurea were obtained.

Example 8 When 5 g. of azobenzene, 1 g. of cobalt stearate and 50 cc. of benzene were treated the same as in Example 5, 1.9 g. (29.2%) of 3-phenyl-2.4-dioxo-1.2.3.4-tetrahydroquinazoline and 0.5 g. of diphenylurea were obtained.

Example 9 When 5 g. of 4-methylazobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were treated the same as in Example 5, 2.3 g. (35.9%) of 3-phenyl-6-methyl-2A- dioxo-1.2.3.4-tetrahydroquinazo1ine of a melting point of 295 to 296 C. and 0.2 g. of a diphenylurea derivative were obtained.

Example 10 5 g. of 4-dimethylaminoazobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were treated the same as in Example 5. When the reaction product was filtered and was recrystallized from alcohol, 1.1 g. (18.0%) of 3- phenyl-6-dimethylamino-2A dioxo 1.2.3.4 tetrahydroquinazoline of a melting point of 281 C. were obtained.

Example 11 When 1 g. of 4.4'-dimethylazobenzene, 1 g. of cobalt carbonyl and 50 cc. ofbenzene were treated under the same condition as in'Example 5, 0.5 g. (40.0%) of 3-ptolyl-6-methyl-2.4-dioxo-1.2.3.4-tetrahydroquinazoline of a melting point of 285 C. was obtained.

Example 12 When 1 g. of 4.4'-dichloroazobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were treated under the same reaction condition as in Example 5, 0.2 g. (16.7%) of 3-p-chlorophenyl6-chloro-2.4-dioxo-1.2.3.4-tetrahydroquinazoline of a melting point of 325 C. was obtained.

Example 13 When 3 g. of 4.4'-dimethoxy-azobenzene, 1 g. of cobalt carbonyl and 50 cc. of benzene were treated the same as in Example 5, 1.0 g. (27.7%) of 3-p-methoxyphenyl- '6-methoxy-2.4-dioxo-l.2.3.4-tetrahydroquinazoline of a melting point of 279 C. was obtained.

Example 14 Example 15 When 1 g. of 2-phenyl-5-methylindazolone,.1 g. of cobalt carbonyl and 50 cc. of benzene were treated by the same operation as in Example 14, 0.5 g. (45.4%) of 3-phenyl-6-methyl-2.4-dioxo 1.2.3.4 tetrahydroquinazoline was obtained.

Example 16 When 1 g. of 2-phenyl-5-chloroindazolone, 1 g. of cobalt carbonyl and 50 cc. of benzene were treated the same as in Example 14, 0.4 g. (36.3%) of 3-phenyl- 6 chloro 2.4 dioxo 1.2.3.4-tetrahydroquinazoline was obtained.

We claim:

1. A method of producing a 3-phenylquinazoline-2,4- dione comprising contacting azobenzene with carbon monoxide in benzene at a pressure of at least about 10 atmospheres and a temperature of from about 200-300 centigrade in the presence of cobalt carbonyl.

2. A method of producing a 3-phenylquinazoline-2A- dione comprising contacting azobenzene with carbon monoxide in benzene at a pressure of at least about 10 atmospheres and a temperature of from about 200-300 centigrade in the presence of iron carbonyl.

3. A method of producing quinazoline derivative comprising contacting an azobenzene of the formula,

wherein R and R are selected from the group consisting of hydrogen and chlorine atoms, and methyl, methoxy and dimethylamino radicals, with carbon monoxide in benzene at a pressure of at least about 10 atmospheres and a temperature of from about 200 to 300 centigrade in the presence of cobalt carbonyl.

7 7 4. A method of produci g quinazoline derivative comprising contacting an azobenzene of'the formula,

- w ng I wherein R and R are selected from the group consisting of hydrogen and chlorine atoms, and methyl-,Vmethoxy Referenees Cited in theefile of this paient V UNITED STATES PAT E NTS H i 2,769,003 Prichard Oct. 30', 19 56 7 ."OTHER REFERENCES 1' "Groggiris; Unit Processes, 4 Hill, N.Y page m Ed. 1-952), Mera w 

1. A METHOD OF PRODUCING A 3-PHENYLQUINAZOLINE-2,4DIONE COMPRISING CONTACTING AZOBENZENE WITH CARBON MONOXIDE IN BENZENE AT A PRESSURE OF AT LEAST ABOUT 10 ATMOSPHERES AND A TEMPERATURE OF RROM ABOUT 200-300* CENTIGRADE IN THE PRESENCE OF COBALT CARBONYL. 